1 A chicken is a bird. Birds are the only type of animal that has feathers. There are more chickens on earth than people! That's because people raise chickens for their eggs and for their meat.2 Most farms have some chickens. People like to eat chicken eggs. All birds, including chickens, lay eggs. Female birds lay eggs. Chickens are an important food source for people.3 A male chicken is called a rooster or a cock. A hen is a female chicken. A chicken has two legs. A chicken has two wings. All birds have two wings, but not all birds can fly.